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04-19-10, 09:49 AM	#4
Bilge_Rat Silent Hunter Join Date: Apr 2002 Location: standing watch... Posts: 3,856 Downloads: 344 Uploads: 0	here is a good basic explanation: http://www.fas.org/man/dod-101/navy/...P/snr_prop.htm 1. negative gradient: sound curves downward. 2. positive gradient: sound curves upward. 3. effect of a layer: __________________

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